Complementarity of weak lensing and peculiar velocity measurements in testing general relativity

Yong-seon Song, Gong-bo Zhao, David Bacon, Kazuya Koyama, Bob Nichol, L. Pogosian

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We explore the complementarity of weak lensing and galaxy peculiar velocity measurements to better constrain modifications to General Relativity. We find no evidence for deviations from General Relativity on cosmological scales from a combination of peculiar velocity measurements (for Luminous Red Galaxies in the Sloan Digital Sky Survey) with weak lensing measurements (from the Canadian France Hawaii Telescope Legacy Survey). We provide a Fisher error forecast for a Euclid-like space-based survey including both lensing and peculiar velocity measurements and show that the expected constraints on modified gravity will be at least an order of magnitude better than with present data, i.e. we will obtain ≃5% errors on the modified gravity parametrization described here. We also present a model-independent method for constraining modified gravity parameters using tomographic peculiar velocity information, and apply this methodology to the present data set.
Original languageEnglish
Pages (from-to)083523
Number of pages1
JournalPhysical Review D
Issue number8
Publication statusPublished - 15 Oct 2011


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